Am I Eligible for Weight Loss Medication in Australia?
Key Takeaways
A clear, honest guide to what GPs actually assess when deciding whether weight loss medication is appropriate — the criteria, the caveats, and what happens at the consultation.
The Question Everyone Searches But Nowhere Answers Directly
You've heard about Ozempic, Wegovy, or Mounjaro. You want to know if you can get one. But every website either tells you to "talk to your doctor" without giving you any useful information first, or walks you through a generic eligibility checklist without explaining the nuance behind it.
This guide tells you exactly what GPs assess when deciding whether weight loss medication is appropriate — the criteria, the caveats, and the situations where the answer might not be the yes or no you're expecting.
The Clinical Criteria: What Your GP Is Checking
The TGA-approved indications for the two primary weight management medications available in Australia — Wegovy (semaglutide 2.4mg) and Mounjaro (tirzepatide) — establish the clinical baseline that GPs use when assessing eligibility.
BMI ≥ 30 kg/m²
If your BMI is 30 or above, you meet the primary weight-based criterion for weight management pharmacotherapy. This is defined as obesity by the WHO and Australian clinical guidelines.
BMI ≥ 27 kg/m² with a Weight-Related Comorbidity
If your BMI is between 27 and 29.9, you may still be eligible if you have at least one of the following weight-related health conditions:
- Type 2 diabetes or pre-diabetes
- Hypertension (high blood pressure)
- Dyslipidaemia (high cholesterol or triglycerides)
- Obstructive sleep apnoea
- Polycystic ovary syndrome (PCOS)
- Cardiovascular disease or high cardiovascular risk
- Non-alcoholic fatty liver disease
- Osteoarthritis related to excess weight
Prior Efforts at Lifestyle Modification
GPs will typically consider whether you have made genuine efforts to manage your weight through diet and lifestyle changes. This doesn't mean you need to have failed a formal program — it reflects the clinical understanding that pharmacotherapy is an adjunct to, not a replacement for, behavioural change. In practice, if you've struggled with your weight for a meaningful period and have tried reasonable approaches, this criterion is generally met.
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What the GP Will Ask You
At a weight management consultation, your GP will typically cover:
- Current weight and height — to calculate BMI
- Medical history — any existing diagnoses, particularly the comorbidities listed above
- Current medications — to check for interactions; some medications affect weight or interact with GLP-1 medications
- Family history — specifically medullary thyroid carcinoma or MEN2 syndrome, which are contraindications
- History of pancreatitis — a relative contraindication requiring careful discussion
- Pregnancy status and plans — GLP-1 medications are not used in pregnancy
- Weight history and prior attempts — context for treatment planning
- Goals and expectations — to set realistic expectations about timelines and outcomes
Situations Where Eligibility Is Less Straightforward
BMI Just Below 27
The TGA indications begin at BMI 27 (with comorbidities) or 30 (without). If your BMI is 25 or 26 and you do not have relevant comorbidities, most GPs will not prescribe these medications for weight loss — the clinical evidence base and regulatory approval does not extend to this population. Some specialist settings may take a different view, but this is not standard GP practice.
History of Eating Disorders
GPs will be cautious about prescribing appetite-suppressing medications to patients with a history of anorexia, bulimia, or restrictive eating disorders. This is a nuanced area requiring careful clinical judgement.
Mental Health Considerations
Some antidepressant and antipsychotic medications cause weight gain and may interact with the treatment picture. Psychiatric stability is relevant to the GP's assessment of appropriateness.
Severe Gastrointestinal Disease
Conditions such as gastroparesis, inflammatory bowel disease, or severe reflux may be worsened by medications that further slow gastric emptying.
What Happens If You're Eligible?
If your GP assesses you as a suitable candidate, they will:
- Discuss which medication (Wegovy or Mounjaro, and whether Ozempic is appropriate) suits your clinical situation
- Explain the expected side effects and how to manage them
- Discuss the dose escalation schedule
- Issue a private prescription (eScript or paper)
- Arrange a follow-up consultation — typically at 4–8 weeks, then 3-monthly
How to Get Assessed
You don't need a GP referral — any Australian GP can conduct this assessment. Telehealth consultations are a valid pathway and are widely used for weight management.
Weight Loss GP Australia offers bulk billed telehealth consultations for eligible patients across QLD, NSW, VIC, WA, SA, ACT, and TAS. Join our waitlist to be notified when appointments open in your state.
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